C#

using (XmlWriter xmlWriter = XmlWriter.Create(fileName))
        {
            WorkflowMarkupSerializer markupSerializer
                = new WorkflowMarkupSerializer();
            markupSerializer.Serialize(xmlWriter, workflow);
        }

    DesignerSerializationManager dsm
    = new DesignerSerializationManager();
using (dsm.CreateSession())
{
    using (XmlReader xmlReader
        = XmlReader.Create(fileName))
    {
        //deserialize the workflow from the XmlReader
        WorkflowMarkupSerializer markupSerializer
            = new WorkflowMarkupSerializer();
        workflow = markupSerializer.Deserialize(
            dsm, xmlReader) as Activity;

        if (dsm.Errors.Count > 0)
        {
            WorkflowMarkupSerializationException error
                = dsm.Errors[0]
                  as WorkflowMarkupSerializationException;
            throw error;
        }
    }
 }

string commentPattern = @"%.*";

string syntaxPattern = @"(\bif\b)|(\bwhile\b)|(\bclassdef\b)|(\bproperties\b)|(\bend\b)|(\bmethods\b)|(\bfunction\b)|(\belse\b)|(\bfor\b)";